The glycerophosphate has been substituted by inorganic phosphate since glycerophosphate is a metabolite for some bacteria, so they could grow and disgrise the pathogens amount.

• Sterilised by radiation
• Methylene blue removed with pH increased to 8,4
• Cary Blair media for the conservation of pathogens including Neisseria sp., Haemophilus sp. or Streptococcus sp.

Originally developed for faecal samples to transport anaerobic bacteria.